From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The torsional rigidity of an unwelded Bentley III frame at different thicknesses.
| Identifier | ExFiles\Box 86\4\ scan0239 | |
| Date | 8th June 1937 guessed | |
| Bentley III frame, unwelded • .128" thick, 1450 lbs. ft./degree • .104" thick, 1150 lbs. ft./degree | ||